Blade clamp for power tool
A blade clamp for use with a power tool having a reciprocating spindle. The blade clamp comprises a cover threaded to the spindle for relative axial movement thereto in response to rotation of the cover relative to the spindle, an ejector pin positioned within the spindle, and a spring coupling the cover and the spindle. The spring biases the cover toward a first rotational position relative to the spindle coinciding with a locked configuration of the blade clamp. The cover is rotatable against the bias of the spring toward a second rotational position relative to the spindle coinciding with an unlocked configuration of the blade clamp. In the unlocked configuration, the ejector pin maintains the cover in the second rotational position. In response to insertion of a blade into the spindle, the blade clamp is automatically adjustable from the unlocked configuration to the locked configuration.
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This application claims priority to U.S. Provisional Patent Application No. 62/643,851 filed on Mar. 16, 2018, the entire contents of which are incorporated herein by reference.
FIELD OF THE INVENTIONThe present invention relates to blade clamps, and more specifically to blade clamps for securing cutting blades to a power tool.
BACKGROUND OF THE INVENTIONCutting tools, such as jigsaws, typically include a clamp for securing a cutting blade thereto. Such blade clamps may be adjustable between a locked configuration, where the blade is secured to a spindle, and an unlocked configuration, where the blade is removable from the spindle.
SUMMARY OF THE INVENTIONThe present invention provides, in one aspect, a blade clamp for use with a power tool, such as a jigsaw, having a reciprocating spindle. The blade clamp comprises a cover threaded to the spindle for relative axial movement thereto in response to rotation of the cover relative to the spindle, an ejector pin positioned within the spindle, and a spring coupling the cover and the spindle. The spring biases the cover toward a first rotational position relative to the spindle coinciding with a locked configuration of the blade clamp. The cover is rotatable against the bias of the spring toward a second rotational position relative to the spindle coinciding with an unlocked configuration of the blade clamp. In the unlocked configuration, the ejector pin maintains the cover in the second rotational position. In response to insertion of a blade into the spindle, the ejector pin disengages the cover, permitting the spring to rebound and rotate the cover from the second rotational position toward the first rotational position, thereby automatically adjusting the blade clamp from the unlocked configuration to the locked configuration.
The present invention provides, in another aspect, a reciprocating power tool including a housing and a spindle supported by the housing for relative movement therewith. The power tool further includes a blade clamp for securing a blade to the spindle. The blade clamp includes a cover threaded to the spindle for relative axial movement thereto in response to rotation of the cover relative to the spindle. An ejector pin is positioned within the spindle. A spring couples the cover and the spindle. The spring biases the cover toward a first rotational position relative to the spindle coinciding with a locked configuration of the blade clamp. The cover is rotatable against the bias of the spring toward a second rotational position relative to the spindle coinciding with an unlocked configuration of the blade clamp. In the unlocked configuration, the ejector pin maintains the cover in the second rotational position. In response to insertion of the blade into the spindle, the ejector pin disengages the cover, permitting the spring to rebound and rotate the cover from the second rotational position toward the first rotational position, thereby automatically adjusting the blade clamp from the unlocked configuration to the locked configuration.
The present invention provides, in another aspect, a method of operating a blade clamp of a reciprocating power tool. The method includes biasing, with a first spring, a cover of the blade clamp into a first rotational position relative to a spindle to which the blade clamp is coupled. The first rotational position coincides with a locked configuration of the blade clamp. The method further includes biasing an ejector pin positioned within the spindle toward the cover with a second spring. The method further includes maintaining the blade clamp in an unlocked configuration against the bias of the first spring with engagement between the ejector pin and the cover, thereby maintaining the cover in a second rotational position. The method further includes inserting the blade into the spindle, and in response to insertion of the blade into the spindle, disengaging the ejector pin from the cover, permitting the first spring to rebound and rotate the cover from the second rotational position toward the first rotational position, thereby automatically adjusting the blade clamp from the unlocked configuration to the locked configuration.
Other features and aspects of the invention will become apparent by consideration of the following detailed description and accompanying drawings.
Before any embodiments of the invention are explained in detail, it is to be understood that the invention is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the following drawings. The invention is capable of other embodiments and of being practiced or of being carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting.
DETAILED DESCRIPTIONWith reference to
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During insertion of the stem portion 14A of the blade 14 through the aligned slots 74, 98, continued displacement of the blade 14 in the insertion direction also displaces the ejection pin 46 rearward (i.e., to the left from the frame of reference of
To adjust the blade clamp 22 from the locked configuration to the unlocked configuration, the user rotates the cover 42 from the first rotational position against the bias of the torsional spring 50 toward the second rotational position, axially displacing the interior surface 82 of the face 70 away from the shoulder portions 118, thereby releasing the clamping force on the blade 14. Subsequently, the slots 74, 98 are re-aligned such that the shoulder portions 118 of the shank 14A no longer engage the interior surface 82. The compression spring 54 rebounds to displace the pin 46 forward along the longitudinal axis 26, ejecting the blade 14 from the blade clamp 22 through the slot 74. The projections 94 are again received within the slots 86 in the cover 42 upon the pin 46 reaching its forward-most position within the bore 30, again maintaining the blade clamp 22 in the unlocked configuration.
Various features of the invention are set forth in the following claims.
Claims
1. A blade clamp for use with a power tool having a reciprocating spindle, the blade clamp comprising:
- a cover threaded to the spindle for relative axial movement thereto in response to rotation of the cover relative to the spindle, the cover including a front face at one end thereof and a first slot defined in the front face through which a blade is receivable;
- an ejector pin positioned within the spindle; and
- a spring coupling the cover and the spindle;
- wherein the spring biases the cover toward a first rotational position relative to the spindle coinciding with a locked configuration of the blade clamp,
- wherein the cover is rotatable against the bias of the spring toward a second rotational position relative to the spindle coinciding with an unlocked configuration of the blade clamp,
- wherein in the unlocked configuration, the ejector pin maintains the cover in the second rotational position and at least partially protrudes beyond the front face of the cover, and
- wherein, in response to insertion of the blade into the spindle, the ejector pin disengages the cover, permitting the spring to rebound and rotate the cover from the second rotational position toward the first rotational position, thereby automatically adjusting the blade clamp from the unlocked configuration to the locked configuration.
2. The blade clamp of claim 1, wherein the ejector pin includes a second slot at an end thereof protruding beyond the front face of the cover, and wherein the blade is receivable within the second slot.
3. The blade clamp of claim 2, wherein in the unlocked configuration, the first slot and the second slot are rotationally aligned, and in the locked configuration, the first slot and the second slot are rotationally misaligned.
4. The blade clamp of claim 1, wherein the cover includes an inner surface in facing relationship with the spindle and a first attachment element defined at least partially by the inner surface, the first attachment element configured to cooperate with a second attachment element of the ejector pin to maintain the cover in the second rotational position, and wherein insertion of the blade into the spindle displaces the ejection pin, thereby disengaging the first attachment element from the second attachment element.
5. The blade clamp of claim 4, further comprising a second spring for biasing the second attachment element toward the first attachment element.
6. The blade clamp of claim 4, wherein the inner surface extends axially relative to a longitudinal axis of the spindle from the front face to a second end of the cover opposite the one end, wherein the first attachment element is positioned axially inward of the front face at the one end and radially inward of the inner surface relative to the longitudinal axis.
7. The blade clamp of claim 1, further comprising a second spring coupling the spindle and the ejector pin, wherein the second spring biases the ejector pin toward the cover in the unlocked configuration and the locked configuration, and wherein the ejector pin is displaceable by the blade against the bias of the second spring.
8. The blade clamp of claim 7, wherein the ejector pin includes a second slot configured to receive the blade, wherein the front face has an interior surface in facing relationship with the second slot, and wherein the second spring biases the ejector pin toward the interior surface.
9. The blade clamp of claim 1, wherein the spindle includes a notch, wherein the blade is receivable through the first slot into the notch, and wherein a portion of the blade is configured to be clamped between a bottom end of the notch and an interior surface of the front face when the blade clamp is in the locked configuration.
10. The blade clamp of claim 1, further comprising a first attachment element positioned adjacent the front face of the cover, the first attachment element configured to cooperate with a second attachment element of the ejector pin to maintain the cover in the second rotational position, wherein the spindle defines a longitudinal axis extending therethrough, and wherein the first attachment element is positioned radially outward of the first slot relative to the longitudinal axis.
11. A reciprocating power tool comprising:
- a housing;
- a spindle supported by the housing for relative movement therewith; and
- a blade clamp for securing a blade to the spindle, the blade clamp including a cover threaded to the spindle for relative axial movement thereto in response to rotation of the cover relative to the spindle, the cover including a front face at one end thereof and a first slot defined in the front face through which the blade is receivable; an ejector pin positioned within the spindle; and a spring coupling the cover and the spindle,
- wherein the spring biases the cover toward a first rotational position relative to the spindle coinciding with a locked configuration of the blade clamp,
- wherein the cover is rotatable against the bias of the spring toward a second rotational position relative to the spindle coinciding with an unlocked configuration of the blade clamp,
- wherein in the unlocked configuration, the ejector pin maintains the cover in the second rotational position and at least partially protrudes beyond the front face of the cover, and
- wherein in response to insertion of the blade into the spindle, the ejector pin disengages the cover, permitting the spring to rebound and rotate the cover from the second rotational position toward the first rotational position, thereby automatically adjusting the blade clamp from the unlocked configuration to the locked configuration.
12. The reciprocating power tool of claim 11, wherein the ejector pin includes a second slot at an end thereof protruding beyond the front face of the cover, and wherein the blade is received within the second slot.
13. The reciprocating power tool of claim 12, wherein in the unlocked configuration, the first slot and the second slot are rotationally aligned, and in the locked configuration, the first slot and the second slot are rotationally misaligned.
14. The reciprocating power tool of claim 11, further comprising a second spring coupling the spindle and the ejector pin, wherein the second spring biases the ejector pin toward the cover in the unlocked configuration and the locked configuration, and wherein the ejector pin is displaceable by the blade against the bias of the second spring.
15. The reciprocating power tool of claim 11, wherein the cover includes an inner surface in facing relationship with the spindle and a first attachment element defined at least partially by the inner surface, the first attachment element configured to cooperate with a second attachment element of the ejector pin to maintain the cover in the second rotational position, and wherein insertion of the blade into the spindle displaces the ejection pin thereby disengaging the first attachment element from the second attachment element.
16. The reciprocating power tool of claim 15, further comprising a second spring for biasing the second attachment element toward the first attachment element.
17. The reciprocating power tool of claim 11, wherein the spindle includes a notch, wherein the blade is received through the first slot into the notch, and wherein a portion of the blade is clamped between a bottom end of the notch and an interior surface of the front face when the blade clamp is in the locked configuration.
18. A method of operating a blade clamp of a reciprocating power tool, the method comprising:
- biasing, with a first spring, a cover of the blade clamp into a first rotational position relative to a spindle to which the blade clamp is coupled, the first rotational position coinciding with a locked configuration of the blade clamp, the cover threaded to the spindle for relative axial movement thereto in response to rotation of the cover relative to the spindle, the cover including a front face at one end thereof and a first slot defined in the front face through which a blade is receivable;
- biasing an ejector pin positioned within the spindle toward the cover with a second spring;
- maintaining the blade clamp in an unlocked configuration against the bias of the first spring with engagement between the ejector pin and the cover, thereby maintaining the cover in a second rotational position;
- protruding, when the blade clamp is in the unlocked configuration, the ejector pin at least partially beyond the front face of the cover;
- inserting the blade through the first slot of the cover and into the spindle; and
- in response to insertion of the blade into the spindle, disengaging the ejector pin from the cover, permitting the first spring to rebound and rotate the cover from the second rotational position toward the first rotational position, thereby axially moving the cover relative to the spindle and automatically adjusting the blade clamp from the unlocked configuration to the locked configuration.
19. The method of claim 18, wherein inserting the blade through the first slot of the cover and into the spindle includes inserting the blade through a second slot in the ejector pin at an end thereof protruding beyond the front face of the cover, wherein maintaining the blade clamp in the unlocked configuration further comprises rotationally aligning the first slot and the second slot, and wherein in the locked configuration, the first slot and the second slot are rotationally misaligned.
20. The method of claim 18, wherein maintaining the blade clamp in the unlocked configuration further comprises limiting rotational movement of the cover by engagement between a first attachment element of the cover and a second attachment element of the ejector pin, and wherein insertion of the blade into the spindle displaces the ejection pin against the bias of the second spring, thereby disengaging the first attachment element from the second attachment element, and permitting the rotational movement of the cover from the second rotational position to the first rotational position.
21. The method of claim 18, wherein the spindle includes a notch, wherein inserting the blade through the first slot of the cover and into the spindle further comprises inserting the blade through the first slot and into the notch, and wherein, in response to disengaging the ejector pin from the cover, clamping a portion of the blade between a bottom end of the notch and an interior surface of the front face with the bias of the second spring when the blade clamp is in the locked configuration.
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Type: Grant
Filed: Feb 20, 2019
Date of Patent: Nov 17, 2020
Patent Publication Number: 20190283155
Assignee: Milwaukee Electric Tool Corporation (Brookfield, WI)
Inventor: Andrew R. Wyler (Pewaukee, WI)
Primary Examiner: Phong H Nguyen
Application Number: 16/280,439
International Classification: B23D 51/10 (20060101); B23D 49/16 (20060101);